已知:如图,点B,E,F,C在同一条直线上,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/7045e3eb-997b-4b13-8008-daf92f8f487e.png?resizew=174)
(1)求证:
.
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/7045e3eb-997b-4b13-8008-daf92f8f487e.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e153e07a91c773708d981b1d18bbacf8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f83486d310a4423f2fcdf4c0114cc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
更新时间:2024-03-11 12:53:19
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适中
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【推荐1】
中,
,
边的垂直平分线交
于
、
于
,
边的垂直平分线交
于
、
于
、
的垂直平分线于
,求
和
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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【推荐2】如图,在△ABD中,∠BAD=80°,C为BD延长线上一点,∠BAC=130°,∠ABD的角平分线与AC交于点E,连接DE.
![](https://img.xkw.com/dksih/QBM/2020/1/8/2372442900742144/2372736606494720/STEM/e67dcd1fed3746b3a3c64b2a232b0527.png?resizew=193)
(1)求证:点E到DA、DC的距离相等;
(2)求∠BED的度数.
![](https://img.xkw.com/dksih/QBM/2020/1/8/2372442900742144/2372736606494720/STEM/e67dcd1fed3746b3a3c64b2a232b0527.png?resizew=193)
(1)求证:点E到DA、DC的距离相等;
(2)求∠BED的度数.
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解答题-问答题
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【推荐1】如图,在五边形
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,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/7c09337c-72db-4909-9fb3-54133c06ea66.png?resizew=111)
(1)请你添加一个条件,使得
,并说明理由;
(2)在(1)的条件下,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6723f8b9d907981aa735cd96386bee36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02da875ca9f32c1c6a31667f44fede23.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/7c09337c-72db-4909-9fb3-54133c06ea66.png?resizew=111)
(1)请你添加一个条件,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9076fd9849eeb09893d923c368050d4.png)
(2)在(1)的条件下,若
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【推荐2】如图,△ADF≌△BCE,∠B=32°,∠F=28°,BC=5cm,CD=1cm
求:(1)∠1的度数
(2)AC的长
求:(1)∠1的度数
(2)AC的长
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/7f252bfc-b9bc-4fd7-91b2-2ee70f355fe3.png?resizew=154)
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【推荐1】如图,把两个扇形
与扇形
的圆心重合叠放在一起,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/801e6669-87ea-41da-b781-ac53bcc8c8f2.png?resizew=162)
(1)求证:
;
(2)若
,弧
的长为
,弧
的长为
,求阴影部分的面积;
(3)在(2)的条件下求由扇形
围成的圆锥的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7330146c006e1c431e63ac0c6161f4f2.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/801e6669-87ea-41da-b781-ac53bcc8c8f2.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc71a35bdba1c97053be4212d6444176.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ffb19a4c459090200bddd831219a8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d957a68654c4a97d15c0c719982ace4e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
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解答题-证明题
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【推荐1】如图,在四边形ABCD中,E是BC上一点,AE交BD于点O,AD=BD,∠ADB=∠EDC,DE=DC.
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931861725036544/3058317119348736/STEM/4c1bdb3cab7545c988482cf3b0298f7c.png?resizew=251)
(1)求证:△ADE≌△BDC;
(2)若∠AEB=36°,求∠EDC;
(3)若OB=OE,求证:四边形ABCD是平行四边形.
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931861725036544/3058317119348736/STEM/4c1bdb3cab7545c988482cf3b0298f7c.png?resizew=251)
(1)求证:△ADE≌△BDC;
(2)若∠AEB=36°,求∠EDC;
(3)若OB=OE,求证:四边形ABCD是平行四边形.
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【推荐2】如图,P、Q是线段AB的垂直平分线MN的点,∠PAQ与∠PBQ相等吗?为什么?
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